4 image::telemini-v3.0-top.jpg[width=400]
5 image::telemini-v3.0-bottom.jpg[width=400]
7 TeleMini v3 is 0.5 inches by 1.67 inches. It was
8 designed to fit inside an 18mm air-frame tube, but using it in
9 a tube that small in diameter may require some creativity in
10 mounting and wiring to succeed! Since there is no
11 accelerometer, TeleMini can be mounted in any convenient
12 orientation. The default ¼ wave UHF wire antenna attached to
13 the center of one end of the board is about 7 inches long. Screw
14 terminals for the power switch are located in the
15 middle of the board. Screw terminals for the e-matches for
16 apogee and main ejection charges depart from the other end of
17 the board, meaning an ideal “simple” avionics bay for TeleMini
18 should have at least 9 inches of interior length.
20 === TeleMini v3 Screw Terminals
22 TeleMini v3 has four screw terminals on the end of the
23 board opposite the telemetry antenna. Two are for the apogee
24 and two are for main igniter circuits. Another two
25 screw terminals are located in the middle of the board
26 for the power switch. Using the
27 picture above and starting from the top for the pyro terminals
28 and from the left for the power switch terminals, the
29 connections are as follows:
31 .TeleMini v3 Screw Terminals
32 [options="header",grid="all",cols="2,3,10"]
34 |Terminal #|Terminal Name|Description
38 |Apogee pyro channel connection to pyro circuit
42 |Apogee pyro channel common connection to battery +++
46 |Main pyro channel connection to pyro circuit
50 |Main pyro channel common connection to battery +++
54 |Switch connection to flight computer
58 |Switch connection to positive battery terminal
61 === Using a Separate Pyro Battery with TeleMini v3
63 As described above, using an external pyro battery involves
64 connecting the negative battery terminal to the flight
65 computer ground, connecting the switched positive battery
66 terminal to one of the igniter leads and connecting the other
67 igniter lead to the per-channel pyro circuit connection.
68 Because there is no solid ground connection to use on
69 TeleMini, this is not recommended.
71 The only available ground connection on TeleMini v3 are
72 the two mounting holes next to the telemetry
73 antenna. Somehow connect a small piece of wire to one of
74 those holes and hook it to the negative pyro battery terminal.
76 Connecting the positive battery terminal to the pyro
77 charges must be done separate from TeleMini v3, by soldering
78 them together or using some other connector. Note that you
79 must include a switch in the pyro battery positive lead for
82 The other lead from each pyro charge is then inserted into
83 the appropriate per-pyro channel screw terminal (terminal 3 for the
84 Main charge, terminal 1 for the Apogee charge).
86 === Using an Active Switch with TeleMini v3
88 As explained above, an external active switch requires three
89 connections, one to the positive battery terminal, one to
90 the flight computer positive input and one to ground. Again,
91 because TeleMini doesn't have any good ground connection,
92 this is not recommended.
94 The positive battery terminal is available on the Right
95 power switch wire, the positive flight computer input is on
96 the left power switch wire. Hook a lead to either of the
97 mounting holes for a ground connection.
99 === Using Packet Link Mode with TeleMini
101 After TeleMini powers up, it will check to see if some
102 device is attempting to communicate with it using
103 Packet Link Mode. If so, it will switch to idle mode
104 and start communicating. To switch to flight mode,
105 reboot the device either over the radio link or by
106 powering it off and back on.
108 If no ground station is attempting to communicate
109 using Packet Link Mode, TeleMini will enter pad mode
110 and prepare for flight.
112 The sequence of operations to use Packet Link Mode
115 1. Configure the ground station data rate, frequency
116 and callsign to match the TeleMini settings.
118 2. Start Packet Link Mode in the ground station by
119 selecting the desired operation (Safe Flight Data,
120 Configure Altimeter, Fire Igniter or Monitor
121 Idle). Select the TeleBT or TeleDongle device. The
122 red LED should begin flashing rapidly.
124 3. Turn on TeleMini. You should see the red LED flash
125 very rapidly during the initial communication burst,
126 but it should then slow down when the link is idle.
128 Once TeleMini is in Idle mode, it will stay in that
129 mode until rebooted. That means you can stop one
130 Packet Link operation, wait a while and start another
131 Packet Link operation.
133 === Forcing TeleMini radio parameters to known defaults
135 If you don't know what the TeleMini frequency and
136 callsign settings are, you can temporarily force it
137 back to the original default values (frequency
138 434.550MHz, callsign N0CALL) by connecting a wire
139 between hole 3 and hole 6 on the debug connector. Hole
140 3 has the square pad around it, hole 6 is the one
141 nearest the MS5607 baro sensor, which is a rectangular
142 component with a metal cap that has two holes in it.
144 Once TeleMini has been powered up with this wire
145 connected, the wire may be removed. The radio
146 parameters will stay set to these default values until
147 changed by the user or when the device is rebooted.
151 TeleMini v1 is the earlier version of this product. It
152 has a lower-power radio, less storage, no beeper and
153 soldered-in wires instead of screw terminals for the
157 image::telemini-v1-top.jpg[width=400]